omron zen off delay timer

[justin terry]

I am using the zen plc to monitor the flow of a pump. What I have written so far works. If I use a ball valve to throttle flow an emergency stop alarm is generated. My problem is that the alarm is generated when the pump is switched off the alarm is generated also. I have rung that prevents the alarm when pump contactor is off. I believe that I need an off delay timer in the flow switch rung. Not sure how I can show what I have now

 

[burropardo]

relay

I am using the zen plc to monitor the flow of a pump. What I have written so far works. If I use a ball valve to throttle flow an emergency stop alarm is generated. My problem is that the alarm is generated when the pump is switched off the alarm is generated also. I have rung that prevents the alarm when pump contactor is off. I believe that I need an off delay timer in the flow switch rung. Not sure how I can show what I have now

maybe you can add a relay and send the normally closed contact to another input of your zen and moddify your sequence? just maybe as i said it is an otpin isn't good luck!

 

[iant]

You wont need an Off delay
simply dont look at the flow unless the motor has been running for a short time (On Delay) then fault it if the flow stops after that time.
Welcome to the site by the way

 

[iant]

Bit missleading
Use a normally closed Timer contact in paralel with the Flow switch

 

[Lancie1]

[I am] not sure how I can show what I have now.

Print your ZEN program to a PDF file, and attach that file to a new post in this thread. An option (if your program is short) is to do a "Print Screen" of your ladder logic to a JPG picture file, and attach that picture to a new post.